Method for protecting plants in a salt containing environment



United States Patent v METHOD FOR PROTECTING PLANTS IN A SALT CONTAINING ENVIRONMENT Justin H. Reinhart, Jamesburg, N.J., assignor to Olin Mathieson Chemical Corporation, New York, N.Y., a

corporation of Virginia No Drawing. Filed July 9, 1963, Ser. No. 293,840

1 Claim. (Cl. 71-2.5)

This invention relates to new methods for the growth of plants. More particularly, this invention relates to the protection of growing plants from the injurious effects of the presence of salt in the environment in which they are grown. Even more particularly, this invention relates to the treatment of plants with certain compounds to protect the said plants from the injurious effects of salt in the irrigation water applied thereto.

Recently, a great deal of concern has been expressed over the impending shortage of fresh water for agricultural and industrial needs. To solve this problem, fresh water conversion processes have been developed to convert salt water to fresh water. Heretofore, this conversion process has been the only method of employing salt containing water in the growth of plants.

It has now been found that salt containing water can be employed directly in the irrigation of plants without experiencing injury to those plants. plished by treating the plants and their environment with certain Z-mercaptobenzothiazolate compounds.

Among the compounds which may be employed for the purposes of this invention are included such compounds as 2-mercaptobenzothiazolate derivatives, for example, lauryl dimethylammonium 2 mercaptobenzothiazolate; lauryldimethyl ammonium-2-hydroxynaphthalene sulfonate; lauryl 2,4-dimethylbenzyl dimethylammonium- 2 mercaptobenzothiazolate; dodecylbenzyltrimethylammonium-Z-mercaptobenzothiazolate; 1,1 dimethyl-l-dodecylhydrazinium-2-mercaptobenzothiazolate; N amino- N-dodecylpiperidinium-2-mercaptobenzothiazolate.

It has been found that the most preferable method of application to the plants of the compounds is by the dispersion of an aqueous solution thereof directly on the plants or in their immediate environment. The amount of the compound which may be satisfactorily employed in the practice of this invention has been found to vary from about 2 .gm. to about 5 gm. per gallon of water employed for dispersion on or around the plants. However, other methods of application of the compounds are possible with like satisfactory results, for example, the compounds may be dusted directly upon the plants and their environment. For these purposes formulations which will make available a concentration of the compounds of from 400 p.p.m. to 2000 p.p.m. may be employed. For these purposes the selected compound may be dispersed in a substantial amount of a suitable extending agent.

In this disclosure and in the claims appended thereto, the term dispersed is used in its widest possible sense. When it is said that the compounds of this invention are dispersed it means that the particles may be molecular in size and held in true solution in a suitable solvent. It means further that the particle may he colloidal in size and dispersed through a liquid phase in the form of suspension or emulsions or in the form of particles held in suspension by wetting agents.

The term dispersed also means that the particles may be mixed with and spread throughout a solid carrier so that the mixture is in the form of powder or dust. The term dispersed also includes mixtures which are suitable for use as aerosols including solutions, suspensions or emulsions of the agents of this invention in a carrier such as Freon which boils below room temperature at ordinary pressure.

This may be accom-' "ice The term extendingagent as used in this disclosure and in the appended claim, includes any and all of those agents in which the compounds of the instant invention are dispersed. It includes, therefore, the solvents of a true solution, the liquid phase of suspensions, emulsions or aerosols, and the solid phase of dust and powders.

It has been found that the compounds of this invention are active when dispersed in an extending agent at concentrations of 0.1% by weight or even lower. This concentration is effective when the dispersing agent is a liquid but it is preferred to use more concentrated mixtures when the dispersing agent is a solid. This is because liquid dispersions which are, of course, suitable for use as sprays give a more intimate contact with the plants than the solid dispersions and, therefore, lower concentrations are more effective with liquid dispersions.

There are a number of solvents which can be utilized for the preparation of solutions, suspensions or emulsions of the compounds of this invention.

If the active agents are to be applied as aerosols, it is convenient to dissolve them in a suitable solvent and to disperse the resulting solution in a liquid such as Freon which boils below room temperature. For such applications it is better to employ true solutions of the active agent although it is possible to employ suspensions or emulsions of the active agent.

For use as a powder or dust the active ingredients of this invention may be mixed with any of a number of extending agents either organic or inorganic in nature which are suitable for the manufacture of pulverulent preparations. In addition to mixing the ingredients directly the active compounds of this invention may first be dissolved in a suitable solvent and the dry extending agents may be treated with the resulting solution so that after the solvent evaporates off the active ingredient is effectively coated on the surface of the extending agent. The extending agents whichmay be employed include, for example, tricalcium phosphate, calcium carbonate, kaolin, bole, kieselghur, talc, calcined magnesia, boric acid and others. Materials of vegetable origin such as powdered cork, powdered wood and powdered walnut shells are also useful. These mixtures may be used in the dry form or, by the addition of wetting agents, the dry powder can be rendered wettable by water so as to obtain stable aqueous dispersions suitable for use as sprays.

It has been found that the most satisfactory results are obtained when the active ingredient of this invention is present in an amount of from 0.05% to 5.0% by weight of the final composition, and optimally, in an amount of from 0.1 to 2.0% by weight of the final product.

The following examples are illustrative of the invention.

Example 1 Potted bean plants grown in vermiculite are watered daily with a lubricant solution which provides the elements required for growth. Seven to 10 days after planting, 50 ml. of a 400 p.p.m. aqueous solution of lauryldimethylammonium 2 merca-ptobenzothiazollate is poured over the vermiculite of half the bean plants. This treatment is continued for five days. Beginning five days after chemical treatment 1% sodium chloride is added to the nutrient solution employed for daily water. After 7 to 10 days of treatment with the sodium chloride solution the plants treated with the lauryldimethylammonium-Z-mercaptobenzothiazolate are still alive and growing whereas the remaining untreated plants are dead.

Example 2 Tabulated below are the results of experiments conducted in accordance with the procedure set forth in Example 1 with other compounds of this invention.

TABLE I.PERCENT LIVING PLANTS AFTER EXPOSURE TO S L v Compound Employed Untreated Treated Plant Plants Lauryl dimethy1ammonium-2-mercaptobenzothiazolate O 33 11 100 O 67 67 Dodecylbenzyltrimethylammonium-2- mercaptobenzothiazolate 0 33 D 11 55 Do O 100 1,1-Dimethyl-1-dodeoyl hydrazinium-Z- mercaptobenzothiazolate 0 66 Do 11 100 D0 0 100 N -amino-N-dodeeyl piperidinium-Z-mercaptobenzothiazolate 0 100 1 ,l-Dimethyl-l-benzylhy drazinium chloride. 60 Do .V 0 100 Hexamethylene bis(dimethyl-2-propynyl)- ammonium bromide 11 100 Do 30 90 Hexamethylene bis(dodeoyldimethy1) ammonium bromide 67 3-(B enziloy10xy)propyl dimethylethylammonium bromide 10 90 D 0 0 100 2-(Benziloyloxy)ethyldiethylmethylammonium bromide 0 67 0 10 80 [2-(N-Benziloyl-N-ethylamino)ethyl] diethylmethylammonium bromide 0 67 Do 30 50 Diethyl[2-(N-benziloyl-N-benzyl)aminoethyl]methylammonium bromide 3g 20 0 7 2-Pyridimethiol-1-oxide, dimethylstearylamine salt 0 100 D 0 0 100 D0 20 80 2-Pyridinethiol-l-oxide, distearylamine sa 20 100 D o 0 100 N,N-bis(tetramethylene)-1,S-diazacyclotetradeoane dibromide 20 90 D o 0 67 l-Hydroxy hyl-Z-heptadecenyl benzyl-2-imidazolinium chloride 20 90 D 0 O 100 l-(2-Hydro hyl)-2-n-alkyl- 2-imidazo1inium chloride. 20 100 Do 33 67 Cetyl dimethyl ethyl ammonium bromide- 0 67 Dimethyl benzyl higher alkyl ammonium chloride 0 67 This invention may be variously otherwise embodied Within the scope of the appended claim.

What is claimed is:

The method of protecting plants from the injurious efiects of a salt containing environment which comprises applying to said plants and their environment an effective amount of a compound selected from the group consisting of lauryl-dimethylamrnonium-Z-mercaptobenzothiazolate; lauryl-dimethylarnm-onium-2 hy-droxynaphthalene sulfonate; lauryl-2,4-dimethylbenzyl dimethylammonium- 2- mercaptobenzothiazol-ate; dodecylbenzyl trimethylarnmonium-Z-mercaptobenzothiazolate; 1,1-dimethyl-1-dodecylhydrazinium-Z mercaptobenzothiazolate; N amino N- dode cylpiperidinium 2 mercaptobenzothiazolate;said compound dispersed in a substantial amount of a suitable extending agent.

References Cited by the Examiner UNITED STATES PATENTS 2,647,084 7/1953 McDonald.

2,689,173 9/1954 Clarke.

2,860,448 11/1958 Carasso 4758 2,899,340 8/1959 Cohen 260306.6 XR 2,946,155 7/1960 Barnhill.

2,979,863 4/1961 BauWi-n 4758 2,996,371 8/1961 Seifter 711 XR 3,073,064 1/1963 Hemwall 4758 OTHER REFERENCES Condensed Chemical Dictionary, Sixth edition, N.Y., Reinhold, 1961, pages 344, 345, 1098 (1961).

Richards, L. A: Diagnosis and Improvement of Saline and Alkali Soils. Published in 2-1954 by US. Dept. of Agriculture, Washington, DC. as their Agriculture Handbook No. 60, pages 58-52.

LEWIS GOTTS, Primary Examiner.

T. G. CRAVER, Examiner.

L. J. BLACKMAR, A. J. ADAMCIK,

Assistant Examiners. 

